Humminbird LakeMaster Maps deliver unrivaled detail, accuracy and innovative, one-of-a-kind features you need to eliminate unproductive water and find the best fishing spots faster.Specifications and Features: VX Technology: Provides exceptional map performance and customizable color palettes. SmartStrike: Highlights areas of the lake map where fish are most likely biting. Select HD Lakes Only Chart Presets: Simple and easy to change between your own custom view settings. Depth Highlight: Highlight a selected depth range so you can target productive water and stay where the fish are. Shallow Water Highlight: Easy-to-see red shading highlights shallow water areas on an adjustable range from 0 to 60 feet. Water Level Offset: Synchronize the depth contours and shorelines of your LakeMaster charts with the actual water levels of lakes, reservoirs and rivers.